Speaker
Description
This work investigates irradiation-induced degradation mechanisms in RFQ cavities, providing insights critical for lifetime assessment and operational reliability. Pristine and irradiated samples were characterised using Resonant Ultrasound Spectroscopy (RUS) to determine elastic properties, complemented by SEM, FIB and EBSD analyses to assess microstructural evolution before and after proton and self-ion (Cu³⁺) irradiation at different fluences and damage levels. These studies examined the effects of different irradiation parameters on material properties, supported by simulation campaigns for proton losses and dose-depth distributions. Transient Grating Spectroscopy (TGS) revealed significant thermal diffusivity reduction under proton irradiation, while higher fluence and dose levels were associated with the onset of blistering. In-house simulation models and Quartz Crystal Microbalance (QCM) measurements enabled the detailed assessment of sputtering and consequent electrode erosion in RFQ cavities used for light and heavy ions, demonstrating that sputtering can lead to substantial RF frequency detuning. By linking mechanism-specific degradation to RFQ cavity integrity, this study establishes predictive benchmarks and advanced diagnostic methodologies contributing to RFQ cavity design, operational strategies and long-term reliability of accelerator components.
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